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Finding the Fourth Proportional to 1,142.50, 1,712.11 and 621.37

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Solution

The fourth proportional to 1,142.50, 1,712.11 and 621.37 is: 931.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.50 : 1,712.11 = 621.37 : x
  2. Step 2: Convert to fraction form
    1,142.50/1,712.11 = 621.37/x
  3. Step 3: Cross multiply
    1,142.50x = 1,712.11 × 621.37
  4. Step 4: Simplify right side
    1,142.50x = 1,063,845.23
  5. Step 5: Solve for x
    x = 1,063,845.23/1,142.50
  6. Step 6: Final answer
    x = 931.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.